Water reservoir

The water reservoir is filled through one inlet 4 hours later than both together, then another inlet 9 hours later. For how long is filled by each separately?

Correct answer:

a =  10 h
b =  15 h

Step-by-step explanation:

a1+b1=s1 s=a+bab a=4+s b=9+s  a=4+a+bab b=9+a+bab  a2=4(a+b) b2=9(a+b)  a>0;b>0 a=10 b=15 s=6 

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